scsi: ufs: update UFS initialization sequence

During UFS host init, we calibrate the UFS host PHY with
HS-Gear4 Rate-B settings by default. After UFS device is
initialized but before it switched to HS mode, if it
found as UFS 2.x device we re-init the UFS host PHY
with its HS-Gear3 Rate-B settings, then start over
the UFS device initialization again.

Change-Id: I854a34b2e5d76103d447508cf2137427def93d17
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Nitin Rawat <nitirawa@codeaurora.org>
Signed-off-by: Ram Prakash Gupta <rampraka@codeaurora.org>